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The square root of 289 is 17 since 172 or 17 * 17 = 289
The idea is to find a perfect square among its factors, such as two square, three square, etc. In this case, the square root of 68, root(68), equals root(4 x 17) = root(4) x root(17) = 2 root(17).
square root of 9 = 3 but 2, 17 and 23 are irrational numbers
2 square root 17
square root of 85 is 9.2195444 but the in the simplest radical is square root of 5 times square root of 17